Minnesota ENT data breach: six email accounts, one mailbox that could not be ruled out

What happened at Minnesota ENT?

The practice says it secured its network, changed every email password and opened an investigation with outside cybersecurity professionals. The practice says it could not conclude with 100% certainty that the contents of one mailbox were not accessed or acquired.

Date	What the letter and the regulators' records say
On or around January 16, 2026	Unauthorized access to six email accounts detected
July 15, 2026	Review finds personal and health information in the one mailbox
August 12, 2026	Report to HHS (99,714); logged in Massachusetts (14 residents)

The review of a single mailbox took six months.

Was my Social Security number in the Minnesota ENT breach?

The sample letter filed in Massachusetts leaves the list of data items blank, but the notice on Minnesota ENT's own website fills it in. The items vary by person and include first and last name, date of birth, Social Security number, driver's license number, financial account information, medical information and health insurance information.

Data item	Website notice	Massachusetts record (14 residents)
Name	Yes	Not a category
Date of birth	Yes	Not a category
Social Security number	Yes	Yes
Driver's license number	Yes	No
Financial account information	Yes	No
Medical information	Yes	Yes (medical records)
Health insurance information	Yes	Not a category

The website notice says the July 15, 2026 finding was that the impacted files may have contained personal information, and that notices began on August 12, 2026, as state and federal law require. For the 14 Massachusetts residents in Minnesota ENT's notice, the state's record marks Social Security numbers and medical records as breached. The practice says it has no evidence that anyone's information has been used for financial fraud or identity theft. It says it has strengthened its network and made security improvements that outside experts recommended.

What is Minnesota ENT offering?

Item	Detail from the letter
Service	Experian IdentityWorks, for the number of months printed on each letter
Questions	(844) 958-8943, 9:00 a.m. to 6:30 p.m. Eastern Time, Monday to Friday, excluding holidays

The guide to credit monitoring offers sets Minnesota ENT's offer beside other letters, and the guide to healthcare provider breach notices compares other practices' letters.

What the documents leave open

• How the intruder got into six accounts at once.
• Why only one of the six mailboxes is treated as possibly read.

With 99,714 people, Minnesota ENT's report is the 48th largest of the 415 open 2026 reports in the ranking of 2026 healthcare breaches reported to HHS.